Old thread I just happened to look at. You must be using the ball bearing for vise rotation. The wooden stand is not for rotation but to change the angular position. Remove the vertical pin on the right in the first photo to let the top part of the vise rotate in the ball shaped bottom. If the vise has been setting around for a long time, the lubricant in the rotating part may have polymerized and frozen the rotary action. If so, lift the top part out and clean it well. Relubricate it and the vise will rotate easily.